LG 37LT75 (CHASSIS:LD74A) Service Manual ▷ View online
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6.3 Adjustment of RGB
√ Required Equipments
• Remote controller for adjustment
• MSPG-925FS Pattern Generator (Which has XGA
• MSPG-925FS Pattern Generator (Which has XGA
[1024x768] 60Hz 8 color bar 100% pattern shown in Fig. 3 ).
6.3.1 Method of Auto RGB Color Balance
1) Input the PC 1024x768 @ 60Hz 7 Color Bar (MSPG-
925FS model:3, pattern:65) signal into RGB. (using D-sub
to D-sub cable)
to D-sub cable)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment.
3) Press the IN-START key on R/C for adjustment.
[Fig.5 Color Bar Signal]
4) Press the
(Vol.+) key operate To set , then it becomes
automatically.
[Fig.6 Color Bar Signal]
5) Auto-RGB OK means adjustment is completed.
Before adjusting White-balance , the AV ADC
should be done.
should be done.
7. White Balance
√ Test Equipment
• Color Analyzer (CA-210/CH.9)
=> When you adjust LCD color temperature, on Color
analyzer (CA-210), you should use Channel 9 which is
Matrix compensated (White, Red, Green, Blue revised)
by CS-1000 and adjust in accordance with White
balance adjustment coordinate which is specified on
the next..
Matrix compensated (White, Red, Green, Blue revised)
by CS-1000 and adjust in accordance with White
balance adjustment coordinate which is specified on
the next..
*Color temperature standards according to CSM and Module
* White balance adjustment coordinate and color temperature.
• PC (for communication through RS-232C) => UART Baud
rate : 115200 bps
• Luminance Y AV : upper 200 cd/m
2
(Typ : 350 cd/m
2
) =>
Applying to Cool mode
* Connecting picture of the measuring instrument (On Automatic
control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push control R/C IN-START => Enter the
mode of White-Balance, the pattern will come out.
auto controller or push control R/C IN-START => Enter the
mode of White-Balance, the pattern will come out.
• Measurement color analyzer : CS1000 or CA210(CH.9)
[Fig.7Connecting Picture (on Automatic Control) ]
* Auto-control interface and directions
1) Adjust in the place where the influx of light like floodlight
1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
2) In case of PDP: Measure and adjust after sticking the
Color Analyzer (CA-100+, CA210 ) to the side of the
module.
module.
In case of LCD: Adhere closely the Color Analyzer (
CA210 ) to the module less than 10cm distance, keep it
with the surface of the Module and Color Analyzer’s
Prove vertically.(80~100°).
CA210 ) to the module less than 10cm distance, keep it
with the surface of the Module and Color Analyzer’s
Prove vertically.(80~100°).
3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 15 minutes.
- In case of PDP, keep white pattern using inside pattern.
- In case of LCD, using ‘no signal’ or ‘full white pattern’ or
- In case of LCD, using ‘no signal’ or ‘full white pattern’ or
the others, check the back light on.
CSM
LCD
Cool
11,000k
Medium
9,300k
Warm
6,500k
Cool
CS-1000
CA-210(CH 9)
x
0.276
0.276±0.002
y
0.283
0.283±0.002
uv
0.000
0.000
Medium
CS-1000
CA-210(CH 9)
x
0.285
0.285±0.002
y
0.293
0.293±0.002
uv
0.000
0.000
Warm
CS-1000
CA-210(CH 9)
x
0.313
0.313±0.002
y
0.329
0.329±0.002
uv
0.004
0.004
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7.1 Manual white Balance
* One of R Gain / G Gain / B Gain should be kept on 80,
and others are controlled lowering from 80
1) Press "power on" of the control R/C, set heat run to white
by pressing
, and heat run over 15 minutes
(Set : RS-233 Host : PC, Baud Rate : 115200bps,
Download: Cortez).
2) Zero Calibrate CA-100+, and when controlling, stick the
sensor to the center of LCD module surface.
3) Double click In-start key on Controlling R/C and get in
‘white balance’.
4) Set test-pattern on and display inside pattern. Control is
carried out on three color temperature, COOL, MEDIUM,
WARM. (Control is carried out three times,)
WARM. (Control is carried out three times,)
5) When the R/G/B GAIN is 80 on OSD, it is the FULL
DYNAMIC Range of the Module. In order to control white
balance without the saturation of FULL DYNAMIC Range
and DATA, one of R Gain / G Gain / B Gain should be
kept on 80, and other two is controlled lowering from 80.
balance without the saturation of FULL DYNAMIC Range
and DATA, one of R Gain / G Gain / B Gain should be
kept on 80, and other two is controlled lowering from 80.
* Color Temperature: Cool, Medium, Warm
1. When R GAIN is set to 80
1. When R GAIN is set to 80
- Control G GAIN and B GAIN by lowering from 80.
2. When B GAIN is set to 80
- Control R GAIN and G GAIN by lowering from 80.
3. When G GAIN is set to 80
- Control R GAIN and B GAIN by lowering from
192.
One of R Gain / G Gain / B Gain should be kept on
80, and adjust other two lower than 80.
(When R/G/B GAIN are all 80, it is the FULL
80, and adjust other two lower than 80.
(When R/G/B GAIN are all 80, it is the FULL
DYNAMIC Range of Module)
8. Scart RGB(DVR) Adjustment Mode
√ Required Equipments
• Remote controller for adjustment
• MSPG-925FS Pattern Generator (Which has Video Signal:
• MSPG-925FS Pattern Generator (Which has Video Signal:
Color Bar Pattern shown in Fig. 8).
=> Model: 232 / Pattern: 08
1) Input the Video Signal: Color Bar signal into AV1 (using
Full Scart Cable)
(MSPG-925FS, Model:232, Pattern:8)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment.
4) Press ths TURBO-PICTURE Key on R/C for adjustment
3) Press the IN-START key on R/C for adjustment.
4) Press ths TURBO-PICTURE Key on R/C for adjustment
[Fig. 8 Color Bar Signal]
[ Fig. 9 Auto Color Balance]
5) Press the
(Vol.+) key operate To set , then it becomes
automatically. [Fig. 9]
6) Scart RGB(DVR) OK means Scart RGB adjustment is
completed.
9. Set Information(Serial No & Model
name)
1) Setting up like bottom figure(After setting white balance,
this is set)
(Setting: Press ADJ Key in the Adjust remocon.
Select "System Control 2" by using
Select "System Control 2" by using
/
(CH+/-) key,
and press
(ENTER)
Using Adjust remocon, RS-232 Host & Baud Rate &
Download value change
Download value change
2) Bar-code scanning
1> Push the menu button in DTV mode.
Select the STATION => Diagnostics => To set
2> Check the Serial Number.
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TROUBLESHOOTING
1. No power
(1) Symptom
1) Doesn't minute discharge at module.
2) Non does not come in into the front LED.
2) Non does not come in into the front LED.
(2) Check follow
Plug in power cord
No
Yes
Is plug in power cord?
Connect cable.
No
Is connect the Line
Filter and Power
Board Cable?
Replace fuse.
No
Is normal the
Fuse(F100) on Power
Board?
Connect Cable.
After remove the cable connect to
Power Board (except the SC100
connection cable), authorizes the
AC voltage marking on manual.
When ST-BY 5V does not operate,
replace Power Board.
No
Is connect the Power
Board and 13P of VSC
Board Cable?
Yes
Yes
Yes
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2. Protect mode
(1) Symptom
1) After once shining, it does not discharge minutely from module.
2) The relay falls.(The sound is audible “Click”.)
3) It is converted with the color where the front LED is red from green.
2) The relay falls.(The sound is audible “Click”.)
3) It is converted with the color where the front LED is red from green.
(2) Check follow
Is normal the Power
Board?
Replace Power Board.
Is output the normality Low/High
voltage except Stand-by 5V?
voltage except Stand-by 5V?
Yes
No
No
Is normal the each
connector?
Replace connector.
After connecting well each connector,
the normality it operates?
the normality it operates?
Yes
No
No
Is normal the VSC
Board?
After remove P900, P901
normal operation:
Replace VSC Board
Is normal the output voltage after
remove P900, P901 of VSC Board?
remove P900, P901 of VSC Board?
No
Yes
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